Sound Waves

theatrical role 13-1: Sound Waves -When a tune up fork is hit, the prong swings to the fabricate and the molecules atomic number 18 pressed closer together. compression-the component of elevated molecular(a) density and rail line pressure -When the prong moves to the left, the molecules to the effective broadcast apart. rarefaction- battleground of low air pressure and density -As the tuning fork continues to vibrate, it sends out a series of compressions and rarefactions in tout ensemble directions like ripples in a pond. -Sound winds are longitudinal. audible telephone waves-what humans hear; between 20 and 20,000 Hz infrasonic-less than 20 Hz ultrasonic-higher(prenominal) than 20,000 Hz; used to produce images inside the personal structure because short wavelengths are easily reflected off a petty object ex.-Dolphins use short wavelengths for echolocation. -Frequency gibes pitch. Perceived majesty or humbleness of a sound depends on frequency. Th e higher the frequency, the higher the pitch. -Sound waves motivate faster through solids/liquids and when temperature is higher. -Sound waves travel in three dimensions and spread out spherically. plane wave-any spherical wave far from its inception Doppler effect-frequency shift; the result of relative bm between the root of waves and an observer reflexion: ?f = (v/c)f Section 13-2: Sound Intensity and Resonance enthusiasm-amplitude of sound waves; rate at which energy is transferred through a building block area; intensity decreases as distance from the source increases -Intensity and frequency determine which sounds are audible. -Medium range frequencies can be perceive at lower intensities. Sound at low frequencies (below 50 Hz) and high frequencies (above 12,000 Hz) must relatively intense in enact to be heard. -Intensity and distance have an inverse square relationship. formula: P/4?r2 -Frequency determines pitch and intensity (amplitude) determines volume. relative intensity-relates the in! tensity of a given sound to the intensity at the brink of hearing (decibel level); a difference...If you want to get a unspoilt essay, put together it on our website: OrderEssay.net

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